Valve bag



Dec. 13, 1949 J. JQHNSSON 2,490,966

VALVE gm Filed March 20, 1946 Patented Dec. 13, 1949 VALVE BAG JohnJohnsson, Saffle, Sweden, assignor to Billeruds Aktiebolag, Sallie,Sweden, a. corporation of Sweden Application March 20, 1946, Serial No.655,657

In Sweden April 28, 1945 g 4 Claims.

The present invention relates to such valve bags, usualfy constructed asmulti-ply paper bags, as are provided with a tube attached in the valveformed by folding in a corner of the bag. The bag is filled through thistube, which is then sealed at its outer end. The invention has for itsobject to enable the valve tube to be sealed in a single operation bothreadily and effectively after the bag is filled. Further objects andadvantages of the invention will become apparent from the followingdescription of some difierent embodiments of the device, reference beinghad to the accompanying drawings, in which Fig. 1 is a side view of thevalve corner of the bag, the valve being in the condition suitable forfilling the bag, and

Fig. 2 is a longitudinal section through the valve in the samecondition.

Fig. 3 shows the valve corner of the bag seen from above.

Fig. 4 is a longitudinal section through the bag valve after filling ofthe bag and sealing of the valve tube.

Figs. 5 and 6 show another embodiment of the device in the same manneras Figs. 2 and 3. while Figs. 7 and 8 show a third embodiment thereof asseen in section through the valve corner of the bag and obliquely fromabove. respectively.

In the valve formed by folding in a corner of the bag in the mannerusual in valve bags there is attached by means of adhesion or in anyother suitable manner a sleeve or tube I of relatively pliable materialsuch as paper, preferably crned paper. or the like. According to theinvention the outer end of the tube I projects but a short distance fromthe valve and is provided with a tongue 2 of relatively stiif material.such as pasteboard or the like, approximately in the form of a segmentof a circle and attached to the top portion or wall of the tube by meansof adhesion or in any other way. The extension of this tongue in thetransverse direction of the valve is somewhat less than the width of thetube attached in the valve in the normal flattened condition thereof. Inthe embodiment shown in Figs. 1 to 4, the tongue 2 with its straightbase edge extending in the transverse direction of the valve is a shortdistance inside the outer end of the tube I, in other words,approximately at or just inside the outer edge of the top wall of thevalve.

When the bag is to be threaded on to the filler tube of the valve bagfilling machine by means of the valve, the bag is taken by the valvewith one hand so that the valve is subjected to pressure by the handfrom both sides of the bag. By

means of this pressure applied at the tongue 2, this tongue bulges andexpands the valve opening, as shown in Figs. 1 and 2, whereby thethreading on of the valve of the bag to the filler tube is facilitated.After the bag has been filled and removed from the filler tube the outerend of the tube 1 is sealed by folding in the tongue 2 into the valveopening or rather into the pocket or so-called blind valve that isformed in a manner known in and per se between the bottom of the valveopening and the lower portion or wall of the valve tube I attached bymeans of adhesion or in any other manner to the bottom of the valveopening only with its inner end. This folding in of the tongue 2 isreadily executed in a single operation in which the outer end of thetube 1 is doubled about the straight base edge of the tongue and thetube 1 is effectively retained in this sealed condition by the tonguefolded into the blind valve. When folded in, in the manner stated, intothe blind valve, the tongue 2 is in a well protected position, in whichthe tongue and the sealed outer end of the tube will not easily beinadvertently damaged in the handling of the filled bag. The reason why,in the embodiment according to Figs. 1 to 4, the tongue 2 is glued tothe inside of the top portion or wall of the tube l, is that the gluedportion would be subjected to too great strain and would come loose tooeasily on folding in of the tongue into the blind valve, if, in thisembodiment thereof, the tongue were instead glued to the outside of thetube l.

The two embodiments according to Figs. 5 and 6 and Figs. 7 and 8 differfromthe embodiment according to Figs. 1 to 4 by the tongue 2 beingprovided with a base flap 2a separated from the tongue proper 2 by meansof a folding line 3. As a result of the tongue 2 being provided withthis base flap 2a defined by means of the folding line it may be gluedor possibly otherwise attached by means of this flap not only to theinside of the top portion or wall of the tube l but also to the outsidethereof as shown in Figs. 5 and 6, or internally in the valve openingproper to the upper wall thereof, as shown in Figs. '7 and 8, orexternally to the last-mentioned wall. In the latter cases, it may beadvantageous to give the base flap 2a triangular form, as shown in Fig.8, in order that it may be glued to the triangular portion of the upperwall of the valve Where the number of the paper layers forming thisWall, when using a certain method of foldin in constructing the valve,will be reduced, and consequently, the Wall in question thinner than inother places. so that the thickening of the said wall of the valvecaused by gluing the flap 2a thereto Will not be very conspicuous. When,in any one of the embodiments shown in side thereof so that the foldingline of said tongue extends transversely of said tube near the outer endof said valve.

3. In a valve bag of the character described Figs. 5, 6, 7 and 8 onfolding of the outer end 5 having its valve formed by folding in acorner portion of the tube 1, the tongue 2 is folded in between thebottom of the valve openingand the lower portion or wall offthe tube?!formingsthe blind valve, thisfolding is efie'cted about the of the bag,a tube of relatively pliable and bendable material attached insaidovalve and projectingza short. distance therefrom, said: tubeforming'with the bottom of said valve a blind valve, a

folding line 3, which thus replaces the rear edgelfl. tongue ofrelatively stiiT material resistant to of the tongue in the embodimentaccording to" Figs. 1 to 4, while the base flap 2a situated inside thefolding line 3 serves as.a means of attachment for the tongue orfor."strengtheninggthe.

bending and approximately in the form of a segment of a circle,extending transversely of said valve and having a length slightly lessthan the width of'sai'd tube when in normal flattened conattachmentthereof, whereby greater liberty of "15 ditionrsaiditonguesbei gattached to said tube adchoice is obtained as to the place of attachingthe tongue.

What I claim and desire to secure rig Letters Patent is:

1. In a valve bag off-the character described having its valve formed'byfolding inacorner of the bag, a tube of relatively'pliable and"bendablmaterial attached in said'lvalve and projecting a short distancetherefrom; said" tube forming with the bottomofsaid'valve'ablind valve,iand atongue' of relatively, stifi "material "resistanfito bending andapproximately iirtheform' of'a .seg;'- ment ofa circle, said tonguebeing jattachedad jacent the top-sideofsaicl valve andiadjacentthe outerend thereof'whereby'said'tonguemay be fdlded'downwardly' into said-blindvalve and the proj ecting-outer 'end of said tube-may'be doubledand-*thus sealed by the-folding *in'ofsaid tongue into-said blindvalveafter-th'ezbag has been filled through said-tube;

ZFIh-avalve 'bag as claimeddn claim .l,fl said tongue=-having' a" baseflap separated from the tongueitself I by," means ofa folding line aboutwhic'lrsaidtonguemayhefolded'downwardlyinto saidhiind-valve, said-flapbeingjs'o attached'adjacent th'ebuter end ofthe 'va-lveadjacentthe topjacent the top side at the outer end thereof wherebysaidctongue may befolded downwardly into said blind-valve and the projecting outer end ofsaid tubgwill be doubled and thus sealed by the folding of the saidtongue into said blind valve after the bag, has been filled'through saidtube.

4: Iiitavaive bagias claimed in claim 3; said tonguehaving a' b'ase'fiapseparated. from the tonguentseif iby meansof a folding line. about whichsaidttonguemay be folded. into said1blind valve; said: flap"b'eing soattached to said tube adjacentith'e'top side thereofi'that the foldingline'rofisaid tongue'extends transversely of" the tubeineartlre-outerendiof thevalve.

' 0 JOHN JOHNSSONL REFERENCES CITED The followinggreferencesare.of..record. in the I! file of this-patent: A)

STATES PATENTS

